The Effect of Impurities on Oxidation in Supercritical CO2 at 750°C

Conference · Thu Mar 01 04:00:00 EST 2018

OSTI ID:1436041

Pint, Bruce ^[1]; Keiser, Jim ^[1]

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1. ORNL

Both indirect- and direct-fired supercritical CO2 (sCO2) cycles for high efficiency power generation are expected to have impurities that may greatly alter the compatibility of structural alloys in these environments. However, the laboratory data on this subject are limited and inconclusive. For indirect applications, comparison 500-h cycles were conducted at 750°C at 1 and 300 bar with research grade and industrial-grade (higher possible impurities) CO2. The mass change results suggest only limited differences between these conditions for exposures up to 5,000 h. For direct-fired or open cycles, a test rig is being assembled to conduct similar exposures at 750°C/300 bar in CO2+1%O2-0.25%H2O. Commercial Fe- and Ni-base structural alloys were exposed in each environment and reaction products have been characterized after 1,000, 2,500 and 5,000 h exposures.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE; USDOE Office of Fossil Energy (FE); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1436041
• Country of Publication: United States
• Language: English